Being a sore winner??

So I was one of three top runners for a promotion, two of which were girls myself and another girl. Well call the girl F and the guy T.

I didnt get the promotion and neither did T but the other girl F got it.

Well ever since she got the promotion shes been all buddy buddy -talking smack about me with T, and she has a chip on her shoulder about it. (You know how people start acting funny when they talk crap)

Well I was talking to T (just mutual conversation) about how we've been 'busy' today. And F walks up to us and gives him a glare like "tf you doing talking to her", and she didn't even acknoledge me.

And T was like "Yeah i havnt really been working"

And F goes "man i havnt been working ALL SHIFT whatcha mean" bragging she got the promotion.

Like she got the promotion, whys she being that way towards me? We're all on the same team, I dont get it.